Earlier quoted context omitted.
A lot of libertarian managers in the US would disagree with that. From a manager’s perspective the ability to fire anyone at any time is them exercising freedom of association. “Libertarian” has a specific connotation in the US, certainly when we’re discussing employment within the US.
> From a manager’s perspective the ability to fire anyone at any time is them exercising freedom of association. And they wouldn't be wrong in a vacuum, but what you're forgetting about is contract. In order for association to commence, a union is going to present a contract that spells out what happens in that case, assuming it is of concern to the union members, and the manager will be bound to what has been agreed…
I’m just playing devil’s advocate here, I don’t actually care about libertarianism because in the US it’s a label self-applied by many kooks (for example, just look up the Libertarian Party nominees for president in… any of our elections)
By US standards, in the US job market, “unions are a libertarian concept” is something that only someone unfamiliar with US labor dynamics and the local meaning of “libertarian” would say. It’s a pointless exercise of “Look how I define this word outside of meaningful context!”